Our guide was a current Oxford student who could speak to contemporary life at Oxford, including admissions, life inside the colleges, studying practices, and other daily life issues. It was interesting to hear.
We walked into the buildings you otherwise do not get into as a passer-by. You want to see Oxford *behind the walls*, as the outside is pretty, but the inside is magnificent.
Unlike American universities, where you can pretty much wander into most buildings, Oxford's buildings were built long ago to keep out the locals, not invite them in. That continues to today. So plan on getting tours and entry tickets to see inside the colleges.
This tour helps do that.